after a lot research and buying/trying 4 anti static brushes, i finally found one which works fine.
i think, its save to assume that all of the "2 row" brushes are produced at the same factory and only have different printing.
No matter if its a cheap one or a more expansive brand one, the markings on the plastic parts ( from the moulds used to create them) are exactly the same.
Quality control at this factory seems to be mediocre at best.
3 of my recently purchased brushes, leave surface scratches on the record.
I read a lot of online reviews for all the brushes currently available, and i'm not the only one with this problem.
I don't know if the 4th brush leaves no scratches by mere luck, or due to the fact that it appears to be older stock.